Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7792a25eaf91ca…

MALICIOUS

PDF

67.7 KB Created: 2021-02-20 10:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d0c97900facc856e090005bfc64be377 SHA-1: 457d0fd5737424bb407389be400489ee7c4481a1 SHA-256: dc7792a25eaf91ca0e85fd718d9ba82931bf952b59f799ed87adc6a9ab63f81f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs pointing to external PDF files, indicating it functions as a link farm. Several heuristics confirm this, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The primary malicious URL identified is https://yafferge.ru/wix?keyword=night+elie+wiesel+study+guide+pdf, which is flagged as a malicious redirector. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wix?keyword=night+elie+wiesel+study+guide+pdf In PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/a9ec494e.pdfIn PDF document text
    • http://uaregroup.com/53629478467iajut.pdfIn PDF document text
    • https://lexobazotukagof.weebly.com/uploads/1/3/1/4/131407042/wenijoketudab.pdfIn PDF document text
    • https://ratisatemapabuz.weebly.com/uploads/1/3/1/3/131398591/savebuwudali_tadufawoseligu_fopibij.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/2841638.pdfIn PDF document text
    • https://xekigumi.weebly.com/uploads/1/3/0/7/130776031/gixowulegumozat.pdfIn PDF document text
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/luzoxinobe.pdfIn PDF document text
    • http://bimufufedo.22web.org/8080600724.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/c6c36f.pdfIn PDF document text
    • http://skywonder.space/41005611970dz7k0.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/lanubipijukis-pivoze-lewovikajas.pdfIn PDF document text
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/cad1417f6.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/nixufunakurug.pdfIn PDF document text
    • http://shtangye.xyz/tezoxa1thmq.pdfIn PDF document text
    • http://vasazuruxu.iblogger.org/foil_transfer_sheets_michaels.pdfIn PDF document text
    • http://gobigs.space/comparative_dissolution_profile_guideline_fdasoz17.pdfIn PDF document text
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/601e06c16b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sikuva/long_division_worksheet_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/best_cheque_printing_software_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 5160 bytes
SHA-256: c058f2a540abc3d1f59ecdb0efee21a6f2fc5cfa8b69c602cb6bf4dbebb2586b
font_01_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 9968 bytes
SHA-256: a6db1cf1ee5d388c3aee01994fb8220fd53ae3942dbc46b7289ee79e8114a93c

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